Rational reinforcement of slab reinforced concrete for structures for hydraulic installations: Fid-Bau Portal

Rational reinforcement of slab reinforced concrete for structures for hydraulic installations

Mal’tsov, K. A. / Minarskii, A. E.

Conclusions 1. The specific features of solid reinforced-concrete beam, slab, and wall structures of hydraulic engineering installations determine the special nature of fissuring occurring in them, manifested in spindle-shaped cracks with a network of secondary inclined cracks, frequently joining up with the spindle-shaped crack. The formation of this system of fissuring sometimes results in overstressing of the zone in compression and, with the operational loads, the rigidity of the structures diminishes, while the resistance of the structures to shearing forces evidently diminishes in the absence of transverse reinforcement. 2. In the case of some structures of hydraulic engineering installations, this type of fissuring is impermissible, since, under certain conditions, it lowers reliability and reduces the service life of the structures, particularly in the case of reversing and repetitive loads and with various types of aggressive media. 3. In order to prevent this type of fissuring or to reduce the harmful effect of spindle-shaped cracks, one of the most effective measures is distribution of the transverse reinforcement over the height of the section, in addition to supplementary anchoring of the reinforcing bars at the points of failure. In order to obtain the necessary strength of solid thick-walled structures with a small percentage of reinforcement in the presence of large shearing forces, design transverse reinforcement is necessary, as demonstrated by experïments on full-scale members. 4. The task of future investigations should be the investigation of more rational measures for increasing the percentage of reinforcement in hydraulic engineering structures, and at the same time improving their economics.